Hot-blast stove



Patented Nov. 29,1898.

F. C. ROBERTS.

HOT BLAST STOVE.

(Application led Aug. 9, 1898.) (No Model.)

NTTED STATES PATENT OFFICE.

FRANK C. ROBERTS, OF PHILADELPHIA, PENNSYLVANIA.

HOT-BLAST STOVE.

SPECIFICATION forming part of Letters Patent No. 614,894, dated November 29, 1898.

Application tiled August 9 1898.

To all whom, it may concern:

Be it known that I, FRANK C. ROBERTS, a citizen of the United States, residing at Philadelphia, in the county of Philadelphia, State of Pennsylvania, have invented an Improvement in Hot-Blast Stoves, of which the following, taken in connection with the accompanying drawings, is a full and clear specication.

My invention relates to improvements in hot-blast stoves, whereby the tendency to ac-l cumulate dirt and dust in the checker-work is decreased. I attain these objects in the manner illustrated in the accompanying drawings, in which- Figure l is a vertical section through a twopass hot-blaststove; Fig. 2, a horizontal crosssection through A B, (see Fig. 1;) Fig. 3, a horizontal section through C D, (see Fig. 1;) and Fig. 4, a vertical section through the bottom of the stove, taken at right angles to Fig.

l on line E F.

Similar letters refer to similar parts throughout the several views.

As ordinarily constructed 'a two-pass hotblast stove of the type illustrated in the drawings is built so that the waste gas from the blast-furnace is admitted to and burned in the iiue E, the products of combustion passing upward to the space F at the top of the stove, where they are drawn downward by the draft of the chimney through a series of iiues I-I, said flues being surrounded by firebrick walls I and J, these flues H and walls Iand J being known as checker-Work. In this manner the checker-work becomes highly heated. This heat is in turn imparted to the air-blast for the furnace by disconnecting the gas from the stove and allowing the air-blast on its way to the furnace to pass through the highly-heated fines.

Below the flues I-I is usually provided a chamber in which are located the walls supporting the checker-work and to which is connected the opening leading to the chimney, thus providing connection between the chimney and all flues H at one and the same time. My improvement relates to the part of the stove immediately under the checker-work. Otherwise my construction is similar to that usually employed.

The waste gases from a blast-furnace carry Serial No. 688,221. (No model.)

a considerable quantity of dirt anddust. A large portion ,of this dirt and dust is deposited upon the top of the checker-work in the ordinary construction of a two-pass stove described above. This deposition of dirt is due to the large combined sectional area of the ilues H and consequent low velocity of flow of the products of combustion.

The object of my invention is to so construct a two-pass stove that the velocity of the products of combustion where they enter the checker-work will be increased without reducing the heating capacity of the stove. To this end I extend the chimney connection G into the stove until it meets the wall K. This extension of the chimney connection I prefer to' construct with arch L, carried by side walls M. The checker-work is supported by side walls N, placed at right angles to M and having between them spaces O, which communicate with the flues H in the checkerwork. In M, I provide openings P, leading from O to the chimney connection or iiue G. On top of the arches L and extending under the checkers in line with one of the walls J, I provide a wall Q, the purpose and evident result of this wall being to divide the checkerwork in two halves vertically. In the openings P, I provide dampers R, carried by rods or shafts S, to which they are attached, these dampers being operated from the outside of the stove by means of the crank T, attached to S.

The Voperation of my improvement is as follows: When it is desired to heat the stove, gas is admitted to and burned in flue E, the dampers R on one side only of Gbeing open. As a result the products of combustion are drawn downward through one-half only of the checker-work, a condition which doubles the velocity of ow over what it would be in case the stove were of ordinary construction. When one-half of the stove is heated, the dampers on the heated side of the stove are closed and those on the cold side opened and the heating process repeated.

The iiue E, I callthe uppass,7 and the flues H, collectively, I call the down-pass.

I do not limit my invention to the form or construction of flue G, dampers R, or the operating device for said dampers shown in the drawings. Any approved form or con- Ioo struction may be employed, provided the application is made to a two-pass stove consisting of one 11p-pass and one down-pass.

Having fully described myinvention, what l claim, and desire to cover by Letters Patent, is

In a two-pass hot-blast stove consisting of one 11p-pass and one down-pass, the combination of a system of checker-Work located in the down-pass, a chimney-flue extending across and under said checker-work, a wall or other device coinciding with said chimney-flue and dividing' the checker-work into two halves vertically, a seriesA of openings in each side of said chimney-flue forming connections be- 1'5 tween the adjacent half of the checker-work and the chimney-flue, dampers placed in said openings and a device or devices for operating said dampers.

In testimony whereof I have hereunto set zo my hand this 3d day of August, 1898.

FRANK C. ROBERTS.

Vitnesses:

L. K. LOGHMAN, J. G. BAYLEY. 

